1. Virtual RealityCS60-520 Presentation
Instructor: Dr. Aggarwal
Student: Yang Gao
Semester: Winter 2004
The history of VR
Types of VR
Technologies of VR
Architecture of VR system
Applications of VR
Current problems & Future work
3. IntroductionWhat is Virtual Reality(VR)?
Virtual Reality refers to a high-end user
interface that involves real-time
simulation and interactions through
multiple sensorial channels.
4. Introduction (Cont’d)Introduction
VR is able to immerse you in a
computer-generated world of your own
making: a room, a city, the interior of
human body. With VR, you can explore
any uncharted territory of the human
5. Brief HistoryBrief History
In 1950s, flight simulators were built by US Air
Force to train student pilots.
In 1965, a research program for computer
graphics called “The Ultimate Display” was
In 1988, commercial development of VR
In 1991, first commercial entertainment VR
system "Virtuality" was released.
6. Types of VR SystemTypes of VR System
Windows on World(WoW)
– Also called Desktop VR.
– Using a conventional computer monitor to
display the 3D virtual world.
– Completely immerse the user's personal viewpoint inside
the virtual 3D world.
– The user has no visual contact with the physical word.
– Often equipped with a Head Mounted Display (HMD).
7. Types of VR System(Cont’d)Types of VR System(Cont’d)
– A variation of visualizing complete computer
– Links remote sensors in the real world with the senses of
a human operator. The remote sensors might be located
on a robot. Useful for performing operations in dangerous
8. Types of VR System(Cont’d)Types of VR System(Cont’d)
Mixed Reality(Augmented Reality)
– The seamless merging of real space and virtual space.
– Integrate the computer-generated virtual objects into the
physical world which become in a sense an equal part of
our natural environment.
– A simulated world runs on several computers which are
connected over network and the people are able to
interact in real time, sharing the same virtual world.
9. VR Examples (Cont’d)VR Examples (Cont’d)
10. VR Examples (Cont’d)VR Examples (Cont’d)
11. VR Examples (Cont’d)VR Examples (Cont’d)
12. Technologies of VR--HardwareTechnologies of VR--Hardware
Head-Mounted Display (HMD)
A Helmet or a face mask providing the visual and auditory
Use LCD or CRT to display stereo images.
May include built-in head-tracker and stereo headphones
13. Technologies of VR--HardwareTechnologies of VR--Hardware
Binocular Omni-Orientation Monitor (BOOM)
Head-coupled stereoscopic display device.
Uses CRT to provide high-resolution display.
Convenient to use.
Fast and accurate built-in tracking.
14. Technologies of VR--HardwareTechnologies of VR--Hardware
Cave Automatic Virtual Environment (CAVE)
Provides the illusion of immersion by projecting stereo
images on the walls and floor of a room-sized cube.
A head tracking system continuously adjust the stereo
projection to the current position of the leading viewer.
15. Technologies of VR--HardwareTechnologies of VR--Hardware
– Outfitted with sensors on the fingers as well as an overall
position/orientation tracking equipment.
– Enables natural interaction with virtual objects by hand gesture
16. Technologies of VR--HardwareTechnologies of VR--Hardware
– Control virtual objects in 3 dimensions.
17. Technologies of VR--SoftwareTechnologies of VR--Software
– Programming libraries.
– Provide function libraries (C & C++).
– Complete programs with graphical interfaces for creating
worlds without resorting to detailed programming.
18. Technologies of VR--SoftwareTechnologies of VR--Software
Software packages available in market
– Multiverse (Freeware)
– Virtual Reality Studio ($100)
– Sense8 World Tool Kit (WTK) (over $1000)
– Autodesk Cyberspace Development kit (over $1000)
19. Technologies of VR--SoftwareTechnologies of VR--Software
VRML(Virtual Reality Modeling Language)
Standard language for interactive simulation
within the World Wide Web.
Allows to create "virtual worlds" networked via
the Internet and hyperlinked with the World
Aspects of virtual world display, interaction and
internetworking can be specified using VRML
without being dependent on special gear like
VR models can be viewed by Netscape or IE with a
20. Architecture of VR SystemArchitecture of VR System
Input Processor, Simulation Processor,
Rendering Processor and World
21. Components of VR System (Cont’d)Components of VR System (Cont’d)
– Control the devices used to input
information to the computer. The object is
to get the coordinate data to the rest of the
system with minimal lag time.
– Keyboard, mouse, 3D position trackers, a
voice recognition system, etc.
– Core of a VR system.
– Takes the user inputs along with any tasks
programmed into the world and determine
the actions that will take place in the virtual
– Create the sensations that are output to
– Separate rendering processes are used for
visual, auditory, haptic and other sensory
systems. Each renderer take a description
of the world stat from the simulation
process or derive it directly from the World
Database for each time step.
World Database (World Description
– Store the objects that inhabit the world,
scripts that describe actions of those
– More vivid
– Move exciting
– More attractive
26. Applications (Cont’d)Applications (Cont’d)
Practice performing surgery.
Perform surgery on a remote patient.
Teach new skills in a safe, controlled environment.
27. Applications (Cont’d)Applications (Cont’d)
– Easy to modify
– Low cost
– High efficient
28. Applications (Cont’d)Applications (Cont’d)
Education & Training
– Driving simulators.
– Flight simulators.
– Ship simulators.
– Tank simulators.
Cybersickness / simulator sickness
Lack of integration between application packages
High-level contact between participants in distributed
30. SummaryVisualization of complicated, large data is
helpful for understanding and analysis.
VR offers us a new way to interact with
VR enables us to experience the virtual world
that is impossible in real world.
VR is changing our life, eventually VR will
increasingly become a part of our life.
 What is Virtual Reality?,
 Augumented and Mixed Reality,
 Virtual Reality Applications,
 K.-P. Beier. Virtual Reality: A short Introduction.
 Franchi,J. Vertual Reality: An Overview. ERIC Digest,
32. Comments & Questions?Comments & Questions?